Circuit configuration and method for automatic recognition and elimination of word line/bit line short circuits

Abstract

A circuit configuration and a method for automatic recognition and elimination of word line/bit line short circuits in a memory cell configuration containing sensor amplifiers, in which the sensor amplifiers split the memory cell configuration into memory blocks. To this end, a fuse is provided in the bit lines in each memory block upstream of the respective sensor amplifiers, the fuse being blown as a result of an appropriate voltage difference being applied in a test mode.

We claim: 
     
       1. An improved circuit configuration for automatic recognition and elimination of word line/bit line short circuits in a memory cell configuration having sensor amplifiers, bit lines and redundant bit lines, the sensor amplifiers splitting the memory cell configurations into memory blocks, the improvement comprising: a fuse disposed in the bit lines upstream of the sensor amplifiers in each memory block, said fuse activated by applying a voltage.   
     
     
       2. The circuit configuration according to claim 1, including a transistor disposed between said fuse and said sensor amplifier. 
     
     
       3. The circuit configuration according to claim 1, wherein said fuse can be activated by applying at least one of a special voltage to said sensor amplifier and an increased voltage to a word line. 
     
     
       4. A method for automatic recognition and elimination of word line/bit line short circuits in a memory cell configuration having sensor amplifiers, bit lines and redundant bit lines, the sensor amplifiers splitting the memory cell configuration into memory blocks, which comprises: during a test mode, disconnecting bit lines having short circuits with word lines by activating fuses in the bits lines, and performing the activating step by applying a voltage to the fuses.   
     
     
       5. The method according to claim 4, which comprises activating the fuses by supplying voltages having an appropriate voltage difference between the word lines and the bit lines.